Loop Help

[HeavyD]

Hi,
I need help. Im new to java and am trying to figure something out.

I want to create a pattern loop where the user enters the number of rows to output and also what to output.

e.g

How many rows: 5
Character to be printed: X

X
XX
XXX
XXXX
XXXXX

Would anyone have any clue where i start or show me the coding to help me understand better??

Thanks

[JavaBean]

Lets say you keep number of rows in numRows variable and character to be printed in charToPrint variable. Then the code will be like this:

Code:

for (int i=1; i<=numRows; i++) {

   for (int j=1; j<=i; j++) System.out.print(charToPrint);
   System.out.println();

}

I guess you already know how to get a character and integer from user. If not try google. If something is unclear let me know.

[HeavyD]

I have the genereal idea but not sure how to do it. Any other help would be greatly appreciated. I'll keep at it.
Thanks

[JavaBean]

This code shows how you can get a String from user:

Java Tips - Reading Text from Standard Input

After you get String you can convert it to integer or character. For converting it to character, you can call charAt(0) method of that string. And you can see the following tip to convert it to integer value:

Java Tips - Conversion from String to integer

Now, you just need to join these pieces together.

[HeavyD]

I've worked out how to let the user input a number and character but still having a problem. Here is the code below. Can anyone tell me what im doing wrong? This is the whole program i created, some which is not complete but its just the FIRST section, pattern section that i need help with.

Code:

import java.util.Scanner;
 
public class assignment1 {
 
       public static void main (String[] args) {
              Scanner keyboard = new Scanner(System.in);
              System.out.println();
              System.out.println("Print Pattern and Reverse String Menu");
              System.out.println();
              System.out.println("A. Print a pattern");
              System.out.println("B. Reverse a string of text");
              System.out.println("X. Exit the programme");
              System.out.println();
              System.out.print("Select an option from the menu (A, B or X): ");
              char option = keyboard.next().charAt(0);
 
              if (option == 'A' || option == 'a') {
                  System.out.println();
                  System.out.print("Enter the number of rows in the pattern to be printed: ");
                  int rows = keyboard.nextInt();
                  System.out.print("Enter character to be printed: ");
                  char character = keyboard.next().charAt(0);
 
                  for (int i = 1; i<=rows; i++) {
                      for (char j=1; j<=i; j++)
                          System.out.print(character + " ");
                      System.out.println();
                  }
              }

              else if (option == 'B' || option == 'b') {
                  System.out.println();
                  System.out.println("Enter a string of text to be reversed: ");
                  String text = keyboard.nextLine();
                  int last = text.length();
                  String reverse = text.substring(last,0);
                  System.out.println("The reverse of the string of text you entered is: " + reverse);
                  System.out.println();
              }
              else if (option == 'X' || option == 'x') {
                System.out.println("Exiting the programme...");
                System.out.println();
                System.exit(0);
              }

              else {
                 System.out.println("Error! You did not select a valid option from the menu");
              }
       }
}

[JavaBean]

As far as i understand your problem, that loop should be:

Code:

for (int i = 1; i<=rows; i++) {
     for (char j=1; j<=i; j++)
         System.out.print(character);
     System.out.println();
}

This should work, what is wrong with this?